Ring-substituted histaprodifen analogues as partial agonists for histamine H1 receptors: synthesis and structure–activity relationships
摘要:
Thirteen racemic benzene ring-substituted analogues of histaprodifen (8a; 2-[2-(3,3-diphenylpropyl)-1H-imidazol-4-yl]ethanamine), a novel lead for potent and selective histamine H-1-receptor agonists, have been prepared from substituted 4,4-diphenylbutyronitriles 5 via cyclization of the corresponding methyl butyrimidates 6 with 2-oxo-4-phthalimido-1-butyl acetate in liquid ammonia, followed by deprotection. Nitriles 5 were accessible by alkylation of either substituted diphenylmethanes with 3-bromopropionitrile or diethyl malonate with substituted 1-chloro-diphenylmethanes and subsequent standard reactions. The title compounds 8 displayed partial agonism on contractile H-1 receptors of the guinea-pig ileum (E-max = 2-98% relative to histamine) and, compared with the endogenous agonist, were endowed with agonist potencies of 4-92%. The meta fluorinated (gc) and meta chlorinated (8f) analogues showed the highest relative potency in this series (95% confidence Limits 85-99% and 78-102%), but did not exceed the value of the lead 8a (99-124%). Compound 8c (2-[2-[3-(3-fluorophenyl)-3-phenylpropyl]-1H-imidazol-4-yl]ethanamine) was a partial agonist at contractile H-1 receptors of the guinea-pig aorta (relative potency 154% vs. 100% for histamine) and at relaxation-mediating endothelial H-1 receptors of the rat aorta (relative potency 556% vs. 100% for histamine) and matched with the functional behaviour of 8a. Agonism observed for each compound was sensitive to blockade by the selective H-1-receptor antagonist mepyramine (pA(2) approximate to 9 (guinea-pig) and pA(2) approximate to 8 (rat aorta)). All histaprodifen analogues 8 stimulated neither histaminergic H-2/H-3, nor cholinergic M-3 receptors. They displayed only low to moderate affinity for these sites (H-2: pD'(2), < 5; H-3/M-3: pA(2) < 6). With regard to the substitution pattern on the benzene ring, there was no correlation between the histaprodifen series and the corresponding derivatives of another selective H-1-receptor agonist, viz. 2-phenylhistamine. (C) 2000 Editions scientifiques et medicales Elsevier SAS.
Development of Modifiable Bidentate Amino Oxazoline Directing Group for Pd-Catalyzed Arylation of Secondary CH Bonds
作者:Kang Chen、Zhao-Wei Li、Peng-Xiang Shen、Hong-Wei Zhao、Zhang-Jie Shi
DOI:10.1002/chem.201406528
日期:2015.5.11
A novel bidentate α‐amino oxazolinyl directinggroup has been developed. Different from previous directinggroups, this newly designed directinggroup was easily prepared from amino acids and modified in structure. This auxiliary preferentially effects functionalization at secondaryC(sp3)Hbonds, rather than at aryl C(sp2)Hbonds. The diastereoselectivity of directarylation between geminal secondary
Electrochemical oxidative decarboxylation and 1,2-aryl migration towards the synthesis of 1,2-diaryl ethers
作者:Faxiang Bu、Lijun Lu、Xia Hu、Shengchun Wang、Heng Zhang、Aiwen Lei
DOI:10.1039/d0sc03708g
日期:——
also radical precursors. Classic transition-metal-catalyzed and photochemical decarboxylation have shown their excellent site selectivity in radical chemistry. However, electrochemical decarboxylation with a long history hasn't got enough attention in recent years. In this work, the electrochemical oxidativedecarboxylation and 1,2-aryl migration of 3,3-diarylpropionic acids have been introduced to construct
[EN] NEW DIFLUOROKETAMIDE DERIVATIVES<br/>[FR] NOUVEAUX DÉRIVÉS DE DIFLUOROCÉTAMIDE
申请人:HOFFMANN LA ROCHE
公开号:WO2016180751A1
公开(公告)日:2016-11-17
The invention provides novel compounds having the general formula (I) wherein R1, R2, R3, R4, R5, R6, R7, R8 and R9 are as described herein, compositions including the compounds and methods of using the compounds.
The invention provides novel compounds having the general formula (I)
wherein R1, R2, R3, R4, R5, R6, R7, R8 and R9 are as described herein, compositions including the compounds and methods of using the compounds.